package laniakea

import (
	"context"
	"errors"
	"path/filepath"
	"reflect"
	"testing"
	"time"

	"git.nix13.pw/scuroneko/laniakea/tgapi"
	"git.nix13.pw/scuroneko/slog"
)

func TestGetUpdateTypesReturnsCopy(t *testing.T) {
	bot := &Bot[NoDB]{updateTypes: []tgapi.UpdateType{tgapi.UpdateTypeMessage}}

	got := bot.GetUpdateTypes()
	got[0] = tgapi.UpdateTypeCallbackQuery

	if want := []tgapi.UpdateType{tgapi.UpdateTypeMessage}; !reflect.DeepEqual(bot.updateTypes, want) {
		t.Fatalf("GetUpdateTypes exposed internal slice: got %v want %v", bot.updateTypes, want)
	}
}

func TestAddPluginsSnapshotsConfiguration(t *testing.T) {
	bot := &Bot[NoDB]{logger: slog.CreateLogger()}
	plugin := NewPlugin[NoDB]("demo")

	cmd := plugin.NewCommand(func(ctx *MsgContext, db NoDB) error { return nil }, "start")
	plugin.AddMiddleware(NewMiddleware("base", func(ctx *MsgContext, db NoDB) bool { return true }))

	bot.AddPlugins(plugin)

	cmd.SetDescription("mutated after registration")
	plugin.NewCommand(func(ctx *MsgContext, db NoDB) error { return nil }, "late")
	plugin.AddMiddleware(NewMiddleware("late", func(ctx *MsgContext, db NoDB) bool { return true }))

	registered := bot.plugins[0]
	if _, exists := registered.commands["late"]; exists {
		t.Fatal("late command leaked into registered plugin snapshot")
	}
	if registered.commands["start"].description != "" {
		t.Fatalf("registered command description unexpectedly mutated: %q", registered.commands["start"].description)
	}
	if len(registered.middlewares) != 1 {
		t.Fatalf("registered middlewares unexpectedly mutated: got %d want 1", len(registered.middlewares))
	}
}

func TestBotPayloadTypeConfiguration(t *testing.T) {
	bot := &Bot[NoDB]{payloadType: BotPayloadBase64}

	if got := bot.GetPayloadType(); got != BotPayloadBase64 {
		t.Fatalf("unexpected initial payload type: %q", got)
	}
	bot.SetPayloadType(BotPayloadJson)
	if got := bot.GetPayloadType(); got != BotPayloadJson {
		t.Fatalf("unexpected updated payload type: %q", got)
	}
	bot.SetStrictPayloadType(true)
	if !bot.strictPayloadType {
		t.Fatal("expected strict payload type to be enabled")
	}
}

func TestAddPluginsSkipsNilPlugin(t *testing.T) {
	bot := &Bot[NoDB]{logger: slog.CreateLogger()}
	plugin := NewPlugin[NoDB]("demo")

	bot.AddPlugins(nil, plugin)

	if len(bot.plugins) != 1 {
		t.Fatalf("expected exactly one registered plugin, got %d", len(bot.plugins))
	}
	if bot.plugins[0].name != "demo" {
		t.Fatalf("unexpected plugin name: %q", bot.plugins[0].name)
	}
}

func TestInitLoggersFallsBackToStdoutLoggerOnFileError(t *testing.T) {
	bot := &Bot[NoDB]{}

	bot.initLoggers(&BotOpts{
		Debug:            true,
		WriteToFile:      true,
		UseRequestLogger: true,
		LoggerBasePath:   filepath.Join(t.TempDir(), "missing", "nested"),
	})

	if bot.logger == nil {
		t.Fatal("expected main logger fallback")
	}
	if bot.RequestLogger == nil {
		t.Fatal("expected request logger fallback")
	}
	if err := bot.RequestLogger.Close(); err != nil {
		t.Fatalf("failed to close request logger: %v", err)
	}
	if err := bot.logger.Close(); err != nil {
		t.Fatalf("failed to close main logger: %v", err)
	}
}

func TestNextPollRetryDelay(t *testing.T) {
	tests := []struct {
		name string
		prev time.Duration
		want time.Duration
	}{
		{name: "initial", prev: 0, want: time.Second},
		{name: "double", prev: 2 * time.Second, want: 4 * time.Second},
		{name: "cap", prev: 20 * time.Second, want: 30 * time.Second},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := nextPollRetryDelay(tt.prev); got != tt.want {
				t.Fatalf("nextPollRetryDelay(%s) = %s, want %s", tt.prev, got, tt.want)
			}
		})
	}
}

func TestAddDatabaseLoggerWriterSkipsWhenDBContextIsUnset(t *testing.T) {
	bot := &Bot[NoDB]{logger: slog.CreateLogger()}
	called := false

	bot.AddDatabaseLoggerWriter(func(db NoDB) slog.LoggerWriter {
		called = true
		return nil
	})

	if called {
		t.Fatal("expected database logger writer to be skipped when db context is unset")
	}
}

func TestAddDatabaseLoggerWriterSkipsWhenDBContextIsNil(t *testing.T) {
	type testDB struct{}

	bot := &Bot[*testDB]{logger: slog.CreateLogger()}
	var db *testDB
	bot.DatabaseContext(db)

	called := false
	bot.AddDatabaseLoggerWriter(func(db *testDB) slog.LoggerWriter {
		called = true
		return nil
	})

	if called {
		t.Fatal("expected database logger writer to be skipped when db context is nil")
	}
}

func TestShouldWarnOnValueDBContext(t *testing.T) {
	type testDB struct{}
	type dbIface interface{ Ping() error }

	tests := []struct {
		name string
		got  bool
		want bool
	}{
		{name: "NoDB", got: shouldWarnOnValueDBContext[NoDB](), want: false},
		{name: "pointer", got: shouldWarnOnValueDBContext[*testDB](), want: false},
		{name: "interface", got: shouldWarnOnValueDBContext[dbIface](), want: false},
		{name: "map", got: shouldWarnOnValueDBContext[map[string]int](), want: false},
		{name: "struct", got: shouldWarnOnValueDBContext[testDB](), want: true},
		{name: "int", got: shouldWarnOnValueDBContext[int](), want: true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if tt.got != tt.want {
				t.Fatalf("shouldWarnOnValueDBContext = %v, want %v", tt.got, tt.want)
			}
		})
	}
}

func TestDatabaseContextMarksValueWarningOnce(t *testing.T) {
	type testDB struct{}

	bot := &Bot[testDB]{logger: slog.CreateLogger()}
	bot.DatabaseContext(testDB{})
	if !bot.warnedValueDB {
		t.Fatal("expected value-typed database context to mark warning state")
	}

	ptrBot := &Bot[*testDB]{logger: slog.CreateLogger()}
	ptrBot.DatabaseContext(&testDB{})
	if ptrBot.warnedValueDB {
		t.Fatal("did not expect pointer-typed database context to mark warning state")
	}
}

func TestRunWithContextRejectsSecondRun(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	cancel()

	bot := &Bot[NoDB]{
		logger:      slog.CreateLogger(),
		prefixes:    []string{"/"},
		plugins:     []Plugin[NoDB]{{name: "demo"}},
		updateQueue: make(chan *tgapi.Update, 1),
		maxWorkers:  1,
	}

	if err := bot.RunWithContext(ctx); err != nil {
		t.Fatalf("first RunWithContext returned error: %v", err)
	}
	if err := bot.RunWithContext(ctx); !errors.Is(err, ErrBotAlreadyRun) {
		t.Fatalf("expected ErrBotAlreadyRun on second run, got %v", err)
	}
}